Measurement of the inclusive isolated prompt photon cross-section in pp collisions at sqrt(s)= 7 TeV using 35 pb-1 of ATLAS data

ArXiv 1108.0253 (2011)

Torus and active galactic nucleus properties of nearby Seyfert galaxies: Results from fitting infrared spectral energy distributions and spectroscopy

Astrophysical Journal 736:2 (2011)

Authors:

A Alonso-Herrero, C Ramos Almeida, R Mason, A Asensio Ramos, PF Roche, NA Levenson, M Elitzur, C Packham, JM Rodríguez Espinosa, S Young, T Díaz-Santos, AM Pérez-García

Abstract:

We used the CLUMPY torus models and a Bayesian approach to fit the infrared spectral energy distributions and ground-based high angular resolution mid-infrared spectroscopy of 13 nearby Seyfert galaxies. This allowed us to put tight constraints on torus model parameters such as the viewing angle i, the radial thickness of the torus Y, the angular size of the cloud distribution σtorus, and the average number of clouds along radial equatorial rays N0. We found that the viewing angle i is not the only parameter controlling the classification of a galaxy into type 1 or type2. In principle, type 2s could be viewed at any viewing angle i as long as there is one cloud along the line of sight. A more relevant quantity for clumpy media is the probability for an active galactic nucleus (AGN) photon to escape unabsorbed. In our sample, type 1s have relatively high escape probabilities, Pesc ∼ 12%-44%, while type 2s, as expected, tend to have very low escape probabilities. Our fits also confirmed that the tori of Seyfert galaxies are compact with torus model radii in the range 1-6pc. The scaling of the models to the data also provided the AGN bolometric luminosities L bol(AGN), which were found to be in good agreement with estimates from the literature. When we combined our sample of Seyfert galaxies with a sample of PG quasars from the literature to span a range of Lbol(AGN) ∼ 1043-1047 erg s-1, we found plausible evidence of the receding torus. That is, there is a tendency for the torus geometrical covering factor to be lower (f2 ∼ 0.1-0.3) at high AGN luminosities than at low AGN luminosities (f2 ∼ 0.9-1 at ∼ 1043-1044 erg s-1). This is because at low AGN luminosities the tori appear to have wider angular sizes (larger σtorus) and more clouds along radial equatorial rays. We cannot, however, rule out the possibility that this is due to contamination by extended dust structures not associated with the dusty torus at low AGN luminosities, since most of these in our sample are hosted in highly inclined galaxies. © 2011. The American Astronomical Society. All rights reserved.

Search for neutral MSSM Higgs bosons decaying to tau^+ tau^- pairs in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector

ArXiv 1107.5003 (2011)

Measurement of the W+W- Cross Section in s=7 TeV pp Collisions with ATLAS

Physical Review Letters American Physical Society (APS) 107:4 (2011) 041802

Authors:

G Aad, B Abbott, J Abdallah, AA Abdelalim, A Abdesselam, O Abdinov, B Abi, M Abolins, H Abramowicz, H Abreu, E Acerbi, BS Acharya, DL Adams, TN Addy, J Adelman, M Aderholz, S Adomeit, P Adragna, T Adye, S Aefsky, JA Aguilar-Saavedra, M Aharrouche, SP Ahlen, F Ahles, A Ahmad, M Ahsan, G Aielli, T Akdogan, TPA Åkesson, G Akimoto, AV Akimov, A Akiyama, MS Alam, MA Alam, S Albrand, M Aleksa, IN Aleksandrov, F Alessandria, C Alexa, G Alexander, G Alexandre, T Alexopoulos, M Alhroob, M Aliev, G Alimonti, J Alison, M Aliyev, PP Allport, SE Allwood-Spiers, J Almond, A Aloisio, R Alon, A Alonso, MG Alviggi, K Amako, P Amaral, C Amelung, VV Ammosov, A Amorim, G Amorós, N Amram, C Anastopoulos, T Andeen, CF Anders, KJ Anderson, A Andreazza, V Andrei, M-L Andrieux, XS Anduaga, A Angerami, F Anghinolfi, N Anjos, A Annovi, A Antonaki, M Antonelli, S Antonelli, A Antonov, J Antos, F Anulli, S Aoun, L Aperio Bella, R Apolle, G Arabidze, I Aracena, Y Arai, ATH Arce, JP Archambault, S Arfaoui, J-F Arguin, E Arik, M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov, G Artoni, D Arutinov, S Asai, R Asfandiyarov, S Ask, B Åsman, L Asquith, K Assamagan, A Astbury, A Astvatsatourov, G Atoian, B Aubert, B Auerbach, E Auge, K Augsten, M Aurousseau, N Austin, R Avramidou, D Axen, C Ay, G Azuelos, Y Azuma, MA Baak, G Baccaglioni, C Bacci, AM Bach, H Bachacou, K Bachas, G Bachy, M Backes, M Backhaus, E Badescu, P Bagnaia, S Bahinipati, Y Bai, DC Bailey, T Bain, JT Baines, OK Baker, MD Baker, S Baker, F Baltasar Dos Santos Pedrosa, E Banas, P Banerjee, Sw Banerjee, D Banfi, A Bangert, V Bansal, HS Bansil, L Barak, SP Baranov, A Barashkou, A Barbaro Galtieri, T Barber, EL Barberio, D Barberis, M Barbero, DY Bardin, T Barillari, M Barisonzi, T Barklow, N Barlow, BM Barnett, RM Barnett, A Baroncelli, AJ Barr, F Barreiro, J Barreiro Guimarães da Costa, P Barrillon, R Bartoldus, AE Barton, D Bartsch, V Bartsch, RL Bates, L Batkova, JR Batley, A Battaglia, M Battistin, G Battistoni, F Bauer, HS Bawa, B Beare, T Beau, PH Beauchemin, R Beccherle, P Bechtle, HP Beck, M Beckingham, KH Becks, AJ Beddall, A Beddall, S Bedikian, VA Bednyakov, CP Bee, M Begel, S Behar Harpaz, PK Behera, M Beimforde, C Belanger-Champagne, PJ Bell, WH Bell, G Bella, L Bellagamba, F Bellina, M Bellomo, A Belloni, O Beloborodova, K Belotskiy, O Beltramello, S Ben Ami, O Benary, D Benchekroun, C Benchouk, M Bendel, BH Benedict, N Benekos, Y Benhammou, DP Benjamin, M Benoit, JR Bensinger, K Benslama, S Bentvelsen, D Berge, E Bergeaas Kuutmann, N Berger, F Berghaus, E Berglund, J Beringer, K Bernardet, P Bernat, R Bernhard, C Bernius, T Berry, A Bertin, F Bertinelli, F Bertolucci, MI Besana, N Besson, S Bethke, W Bhimji, RM Bianchi, M Bianco, O Biebel, SP Bieniek, J Biesiada, M Biglietti, H Bilokon, M Bindi, S Binet, A Bingul, C Bini, C Biscarat, U Bitenc, KM Black, RE Blair, J-B Blanchard, G Blanchot, T Blazek, C Blocker, J Blocki, A Blondel, W Blum, U Blumenschein, GJ Bobbink, VB Bobrovnikov, SS Bocchetta, A Bocci, CR Boddy, M Boehler, J Boek, N Boelaert, S Böser, JA Bogaerts, A Bogdanchikov, A Bogouch, C Bohm, V Boisvert, T Bold, V Boldea, NM Bolnet, M Bona, VG Bondarenko, M Boonekamp, G Boorman, CN Booth, S Bordoni, C Borer, A Borisov, G Borissov, I Borjanovic, S Borroni, K Bos, D Boscherini, M Bosman, H Boterenbrood, D Botterill, J Bouchami, J Boudreau, EV Bouhova-Thacker, C Boulahouache, C Bourdarios, N Bousson, A Boveia, J Boyd, IR Boyko, NI Bozhko, I Bozovic-Jelisavcic, J Bracinik, A Braem, P Branchini, GW Brandenburg, A Brandt, G Brandt, O Brandt, U Bratzler, B Brau, JE Brau, HM Braun, B Brelier, J Bremer, R Brenner, S Bressler, D Breton, D Britton, FM Brochu, I Brock, R Brock, TJ Brodbeck, E Brodet, F Broggi, C Bromberg, G Brooijmans, WK Brooks, G Brown, H Brown, E Brubaker, PA Bruckman de Renstrom, D Bruncko, R Bruneliere, S Brunet, A Bruni, G Bruni, M Bruschi, T Buanes, F Bucci, J Buchanan, NJ Buchanan, P Buchholz, RM Buckingham, AG Buckley, SI Buda, IA Budagov, B 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Farooque, SM Farrington, P Farthouat, P Fassnacht, D Fassouliotis, B Fatholahzadeh, A Favareto, L Fayard, S Fazio, R Febbraro, P Federic, OL Fedin, I Fedorko, W Fedorko, M Fehling-Kaschek, L Feligioni, D Fellmann, CU Felzmann, C Feng, EJ Feng, AB Fenyuk, J Ferencei, J Ferland, W Fernando, S Ferrag, J Ferrando, V Ferrara, A Ferrari, P Ferrari, R Ferrari, A Ferrer, ML Ferrer, D Ferrere, C Ferretti, A Ferretto Parodi, M Fiascaris, F Fiedler, A Filipčič, A Filippas, F Filthaut, M Fincke-Keeler, MCN Fiolhais, L Fiorini, A Firan, G Fischer, P Fischer, MJ Fisher, SM Fisher, M Flechl, I Fleck, J Fleckner, P Fleischmann, S Fleischmann, T Flick, LR Flores Castillo, MJ Flowerdew, F Föhlisch, M Fokitis, T Fonseca Martin, DA Forbush, A Formica, A Forti, D Fortin, JM Foster, D Fournier, A Foussat, AJ Fowler, K Fowler, H Fox, P Francavilla, S Franchino, D Francis, T Frank, M Franklin, S Franz, M Fraternali, S Fratina, ST French, R Froeschl, D Froidevaux, JA Frost, C Fukunaga, E Fullana Torregrosa, J 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Abstract:

This Letter presents a measurement of the W+ W- production cross section in sqrt(s) = 7  TeV pp collisions by the ATLAS experiment, using 34  pb(-1) of integrated luminosity produced by the Large Hadron Collider at CERN. Selecting events with two isolated leptons, each either an electron or a muon, 8 candidate events are observed with an expected background of 1.7 ± 0.6 events. The measured cross section is 41(-16)(+20)(stat) ± 5(syst)±1(lumi)  pb, which is consistent with the standard model prediction of 44 ± 3  pb calculated at next-to-leading order in QCD.

Properties of jets measured from tracks in proton-proton collisions at center-of-mass energy sqrt(s) = 7 TeV with the ATLAS detector

ArXiv 1107.3311 (2011)